This is the 2727th most frequent Polish word.
dowolnym
"Dowolnym" means "any" or "optional" in English.
The word 'dowolnym' functions here as an adjective agreeing in instrumental case with 'sposobem', describing the method as freely chosen.
Możesz wybrać dowolnym sposobem.
You can choose by any method.
The word 'dowolnym' is used here in the instrumental case to modify 'miejscu', indicating an unrestricted or freely chosen place.
Naszym celem jest pomóc w dowolnym miejscu na świecie.
Our goal is to help in any place in the world.
In this sentence, 'dowolnym' qualifies 'kluczem' as a descriptor in instrumental case, indicating freedom of choice among keys.